The East Coast is on edge. Hurricane Joaquin is the reason why. On Thursday, it lashed the Bahamas as a Category 4 storm with 130 mph winds. It’s what is expected to come next that has the United States worried: a stronger storm and a sharp turn north. That’s why officials from South Carolina to New England have issued dire warnings to residents urging them to be ready. A lot could still happen with Joaquin; but one thing they don’t want to happen is another Superstorm Sandy -- a strong, October hurricane that hit the Caribbean before pounding the Northeast.